Question

.Write the chemical equation of the reaction in which the following changes have taken place with an example of each: 
(i) Change in colour
(ii) Change in temperature
(iii) Formation

Answer 1

(1). The reaction b/w citric acid and purple coloured potassium permanganate solution is characterised by a change in colour from purple to colourless.

(2).The chemical reaction b/w Zinc granules and dilute sulphuric acid is characterised by a change in temperature ( which is rise in temperature).

(3).The chemical reaction b/w potassium iodide and lead nitrate is characterised by the formation of a yellow precipitate of lead iodide.